Recursive Relationship

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Presentation transcript:

Recursive Relationship Customer 1 comprises A customer comprises zero or more customers © Ron McFadyen

Hierarchies Customer1 is hierarchically structured. Any of these customers are ones you may deal with. Each of these appears in the customer dimension. Customer 1 Customer 2 Customer 7 Customer 3 Customer 4 Customer 8 Customer 5 Customer 6 © Ron McFadyen

Hierarchies The valid paths are: Customer 1 Customer 2 Customer 7 © Ron McFadyen

Consider the helper/bridge table Customer bridge Parent customer key Subsidiary customer key Levels from parent Level name Bottom flag Top flag Some useful additional attributes Levels from parent Level name Bottom flag Top flag And we’ll add one extra row for each node paired with itself © Ron McFadyen

Subsidiary customer key Levels from parent Level name Bottom flag Bridge table Customer bridge Parent customer key Subsidiary customer key Levels from parent Level name Bottom flag Top flag And we’ll add one extra row for each node paired with itself How many rows will there be? © Ron McFadyen